Loans Receivable, Net - Text Tag (Details)	12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Recorded Investment	$ 6,900,000	$ 7,500,000
Financing Receivable, Number of Principal and Interest Payment Deferrals		83
Financing Receivable, Principal and Interest Deferred Payments		$ 90,400,000
FNMA & 3rd party loans excluded from financial statements	14,500,000	16,800,000
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt	$ 58,300,000
Number of Loans Originated Under the Paycheck Protection Program	420
Loans Originated Under the Paycheck Protection Program, Amount	$ 57,100,000
Financing Receivable, Principal and Interest Deferred Payments		90,400,000
Other non-performing asset	$ 60,000	$ 60,000
Number of Real Estate Properties	1	1
Loans held-for-sale (HFS)	$ 0	$ 0
Loans Receivable, Impaired, Interest Lost on Nonaccrual Loans	266,000	161,000
Loans 90 Days Past Due and Still Accruing	$ 0	$ 0
Modified Loan Subsequently Defaulted	0	0
Loans and Leases Receivable, Related Parties	$ 30,000	$ 60,000
Loans and Leases Receivable, Related Parties, Additions	0
Loans and Leases Receivable, Related Parties, Proceeds	30,000
Business
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 4,949,000
Overdrafts	5,000	10,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Overdrafts	5,000	10,000
Consumer
Financing Receivable, Modifications [Line Items]
Overdrafts	31,000	44,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Overdrafts	31,000	44,000
Non-performing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 1,700,000	$ 1,800,000